Cancelation

These people have been sending me to pillar and back after I told them that my beame unit is down and they it's been like that since 24 September and when I followed it up they told me they will send a technician to fix it and till this day they never did and another thing is I complained about they deducting R271 on my account and they never rectified the issue and now when I call they to ask about how I must cancel their service they gave me an email address which they don't respond to even after I wrote a cancelation email...it's been over 5 months since I wrote the cancelation email and yet they still send me messages that I should pay the same R271 which is far beyond what we agreed on